The image highlights four types of joints:

1. Ball-and-Socket: The shoulder joints are highlighted. The text box captioned ‘Ball-and-Socket’ reads ‘Found in the shoulders and hips, these joints allow for movement in many directions. They are the most freely movable joints’.
2. Pivot joint: Elbow joints are highlighted. The text box captioned ‘Pivot’ reads ‘These joints allow one bone to rotate or turn around another. Pivot joints allow you to turn your arm at your elbow and shake your head to say no’.
3. Saddle joints: Thumb joints are highlighted. The text box captioned ‘Saddle’ reads ‘These joints allow one bone to slide in two directions. Saddle joints allow a thumb to move across a palm’.
4. Hinge joints: Knee joints are highlighted. The text box captioned ‘Hinge’ reads ‘These joints permit back- and-forth motion, like the opening and closing of a door. They are found in the elbows, knees, and ankles’.